System and methods for correcting spinal deformities

Abstract

A spinal alignment system is disclosed that includes a rod and a plurality of uniplanar screw assemblies that include a screw, a cap, and a housing. The screw and cap are configured such that the relative angular displacement between the screw and the cap is limited to a first limit angle in a first plane and to a second limit angle in a second plane that is perpendicular to the first plane, the second limit angle being larger than the first limit angle. The housing is coupled to the cap and configured to maintain the cap in proximity with the head of the screw. The housing has two elongated elements forming a U-shaped saddle. The alignment system also includes a plurality of locking cap assemblies that capture the rod within the U-shaped saddle and are tightened to fixedly couple the rod to the respective uniplanar screw assemblies.

Description

BACKGROUND[0001]1. Field[0002]The present disclosure generally relates to systems and methods for correcting spinal deformities.[0003]2. Description of the Related Art[0004]The treatment of spinal deformity requires a three dimensional approach and therefore is organized into three primary planes of correction relative to the human body. These three planes include the frontal or coronal plane, the sagittal or lateral plane, and the transverse or axial plane as shown in FIG. 1. Correction and proper alignment of these three planes is often the goal of the surgeon in the treatment of spinal deformity. Spinal deformities of varying etiologies are well known.[0005]Over the past several decades, spinal fusion has been chosen as the standard of practice in the treatment of spinal deformity. Spinal fusion is the implantation of a rigid construct that may include rods, bone screws, hooks, and wires.[0006]Early treatment of spinal deformity, more specifically scoliosis, involved a Harrington...

AI Technical Summary

Benefits of technology

The patent describes a system and method for treating spinal deformities by addressing all three deformity planes (coronal, sagittal, and axial). The system includes uni-planar or monoaxial pedicle screws for a rigid base and derotation tubes or restraint sleeves for precise control and manipulation during spinal derotation. A cluster of derotation tools can be quickly and rigidly assembled for a more complete correction. The system allows for a quick and rigid assembly of a derotation cluster.

Problems solved by technology

Subsequently, the C-D or TSRH technique failed to correct the axially unbalanced vertebra.

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